320 results about "Heat cycling" patented technology

The invention provides a glass thermal cycle control method and a related device. The method comprises the steps of obtaining equipment parameters of target equipment; performing real-time prediction on the equipment parameters through the thermal cycle regulation and control model to obtain glass yield prediction information of the target equipment under different parameter settings; the thermal cycle regulation and control model is a lightweight model which is carried in target equipment and is used for learning the real-time condition of a production environment; based on the glass yield prediction information, generating an optimization strategy of walking program parameters; the optimization strategy comprises equipment parameters corresponding to a glass finished product rate prediction value reaching a preset glass finished product evaluation standard; the glass finished product evaluation standard is related to equipment production demand information of the target equipment; and adjusting the walking program parameters of the target equipment by adopting the optimization strategy so as to control the thermal cycle speed of the target equipment and improve the production efficiency of the target equipment. The walking program parameters can be dynamically predicted and controlled, the thermal cycle speed of the target equipment is controlled, and the production efficiency and the glass quality are improved.

The invention belongs to the technical field of solid oxide batteries, and discloses a nickel-iron support body of a metal-supported solid oxide battery, a total battery and a preparation method. The nickel-iron supporting body of the metal-supported solid oxide battery is made of a nickel-iron alloy material in a reducing atmosphere, a gradient pore structure with gradient pore distribution is prepared and formed through a double-layer casting phase inversion process, and the gradient pore structure is a composite structure comprising a finger-shaped pore channel layer and a skin layer. Compared with a ceramic material, the composite material has higher mechanical strength and thermal conductivity, can better bear thermal shock and mechanical stress, is particularly suitable for high-temperature and rapid thermal cycle working environments, and can keep good structural stability under the rapid heating condition of 50 DEG C / min.

The invention relates to the technical field of power cables, in particular to a heat-aging-resistant crosslinked polyethylene insulated power cable and a preparation method thereof. The cable comprises conductor wire cores, an insulating layer, a filling layer, a composite function layer, a steel tape armoring layer and a sheath layer from inside to outside. The insulating layer is composed of semi-conductive crosslinked polyethylene, silicone resin, nano montmorillonite and an HALS light stabilizer; the filling layer is composed of plasticized glass fabric, polyphenylene sulfide and rare earth oxide; the composite functional layer sequentially comprises a heat-conducting inner layer, a flame-retardant middle layer and an anti-UV outer layer from inside to outside; the sheath layer is composed of polyolefin, white carbon black, ceramic silicone rubber, a flame retardant, polyethylene wax and an initiator. According to the cable, cross-linked polyethylene and silicone resin are preferably selected as heat-resistant materials, heat conduction / flame retardance / UV resistance / armored multi-layer synergistic protection is achieved, the mechanical barrier performance is improved, meanwhile, damage of thermal stress to internal materials is reduced, comprehensive improvement of thermal aging resistance is achieved, and the cable is suitable for high-temperature, high-humidity and frequent thermal cycle harsh environments.

The invention belongs to the technical field of high-performance cutter coatings, and relates to a cross-scale bionic gradient coating design method based on a multi-principal-element high-entropy system, which comprises the following steps: sequentially forming a high-entropy alloy plastic layer, a high-entropy alloy / high-entropy ceramic tough layer and a nanocrystalline high-entropy ceramic superhard layer on the surface of a cutter matrix, and constructing a gradient transition structure; the method comprises the following steps: matching a high-entropy alloy plastic layer with a tool matrix binding phase, optimizing a high-entropy alloy / high-entropy ceramic tough layer material, improving interface binding force, optimizing gradient transition design by adopting thermal-mechanical coupling calculation, constructing an atomic model, simulating and optimizing a microstructure based on molecular dynamics, and establishing a finite element model to simulate thermal cycle and mechanical load. The interface performance is optimized, a mathematical model is constructed through a BP neural network and a particle swarm optimization algorithm, and gradual transition design of the tool base body and the coating is achieved. The problems that the tool coating interface is high in brittleness, insufficient in adhesiveness, limited in thermal stability and the like are solved, and the bonding performance of the coating interface and the stability and durability of the coated tool are improved.

The invention relates to the technical field of solar energy application, in particular to a PVT photovoltaic water-based heat cycle system which comprises a photovoltaic assembly used for converting solar energy into electric energy, a photo-thermal assembly used for utilizing heat energy generated by the photovoltaic assembly and a heat cycle assembly used for circularly supplying heat to a room. The photo-thermal assembly is fixedly connected to the back face of the photovoltaic assembly, the thermal circulation assembly is connected with the photo-thermal assembly, heat-conducting media are arranged in the thermal circulation assembly and the photo-thermal assembly, the photovoltaic assembly and the photo-thermal assembly are integrally connected, the photovoltaic assembly and the photo-thermal assembly are placed outdoors, the thermal circulation assembly is placed indoors, the photovoltaic assembly converts solar energy into electric energy, and the electric energy is stored in the photovoltaic assembly. The photovoltaic assembly generates a large amount of heat, the photo-thermal assembly absorbs the heat on the back face of the photovoltaic assembly, the photo-thermal assembly conducts the heat to the thermal circulation assembly, the thermal circulation assembly heats low-temperature air and blows out the low-temperature air, the indoor temperature can be rapidly increased, and the photovoltaic assembly can be cooled while the heat-conducting medium circulates.

The invention discloses a composite conductive filler, a shielding material and a cable, the composite conductive filler comprises the following raw materials: conductive carbon black, carbon nanotubes and liquid metal, and the mass ratio of the conductive carbon black to the carbon nanotubes to the liquid metal is (80-90): (1-15): (1-12). The composite conductive filler provided by the invention has a ternary synergistic efficient conductive network structure, the contact resistance between the conductive fillers is remarkably reduced, the melt index of the composite conductive filler is greatly improved, meanwhile, micropores of the material can be filled at high temperature, the thermal cycle aging property of the material is remarkably reduced, and the service life of the material is prolonged. The integration of a high-stability conductive network, good processing fluidity and excellent interface thermal mechanical performance is realized. The key technical problem that conductivity, processability and long-term stability of a high-voltage cable semi-conductive shielding material are difficult to consider at the same time is solved, and particularly, the high-voltage cable semi-conductive shielding material can be applied to ultra-high voltage scenes of 110 kV and above.

The invention discloses a welding slag ladle for containing copper slag and a design method. The welding slag ladle is suitable for containing, cooling and inverted placing procedures of high-temperature copper slag. The cinder ladle comprises a cylinder body, a ladle bottom, rib plates, trunnions and supporting legs, the cylinder body and the ladle bottom are formed by welding high-temperature-resistant and high-strength rolled plates, the thickness of the cylinder body is 70-100 mm, and the thickness of the ladle bottom is 80-120 mm; setting an inclination angle beta of 11.5-21 degrees relative to the center line of the bus of the cylinder body, and controlling the roughness of the inner wall to be less than or equal to 12.5 microns so as to reduce the separation resistance after the copper slag is cooled; thickness combination, stress distribution, deformation and rib plate arrangement are optimized through structural mechanical simulation, and it is ensured that the structural strength meets the requirements under high temperature and thermal cycle loads; full penetration weld joints are adopted, nondestructive testing is carried out, and the welding reliability is guaranteed; compared with a traditional casting cinder ladle, the mass of the cinder ladle is reduced by 10%-15%, the deslagging efficiency is improved, the service life is prolonged to more than two times of the original service life, and the cinder ladle has the advantages of being light in structure, high in bearing capacity, high in deformation resistance and good in maintainability.

The invention discloses a silicon carbide power module packaging structure with low thermal resistance and low stress, and belongs to the technical field of semiconductor devices. The packaging structure comprises a metal substrate; the insulating ceramic layer is arranged on the metal substrate; the circuit layer is arranged on the insulating ceramic layer; the lower surface of the silicon carbide chip is connected with the circuit layer through a first interface layer; the composite heat dissipation stress buffer layer is arranged on the upper surface of the silicon carbide chip through a second interface layer; the copper clamp is connected with the upper surface of the composite heat dissipation stress buffer layer through a third interface layer; and the composite heat dissipation stress buffer layer is made of a copper-graphite composite material. According to the invention, the junction temperature of the silicon carbide chip can be greatly reduced, the overall thermal resistance is reduced, the surface stress of the chip is reduced, the warping phenomenon of the chip in the working process is effectively improved, and the long-life reliability of the power module under the long-term thermal cycle working condition is ensured.

The invention discloses a heat pump cold and hot cycle control system based on an intelligent AI, and relates to the technical field of heat pump control, and the system comprises a heat pump system digital twinborn body module which obtains the historical operation data of a heat pump, analyzes the multi-dimensional characteristics of the heat pump under a specific working condition, couples a heat pump mechanism model, and builds a virtual simulation heat pump digital twinborn body; the dynamic load prediction curve module is used for acquiring real-time operation data of the heat pump, introducing an environmental factor as an external dynamic disturbance variable and generating a dynamic load prediction curve of the heat pump; the heat pump system optimal operation mode module is used for generating a user personality portrait, integrating a heat pump load prediction curve, real-time electricity price information and an equipment health state evaluation index, and substituting the user personality portrait, the heat pump load prediction curve, the real-time electricity price information and the equipment health state evaluation index into the virtual simulation heat pump digital twin body to obtain a heat pump optimal operation mode; and the global optimal control instruction set module is used for generating a heat pump global optimal control instruction set by taking the heat pump comprehensive energy efficiency ratio and the user comfort as collaborative optimization targets and utilizing a multi-target decision algorithm. The comprehensive energy efficiency of the system is improved.

The invention relates to the technical field of metal surface coating preparation, in particular to a high-temperature thermal cycle impact resistant yttrium oxide composite coating on the surface of refractory metal and a preparation method of the yttrium oxide composite coating. The refractory metal composite coating material is composed of a refractory metal matrix and a coating. The coating comprises a bonding layer, a middle layer and a surface layer which are arranged in a contact manner; the bonding layer is composed of the refractory metal and yttrium oxide, and the porosity of the bonding layer is 1%-5%; the middle layer is a pure yttrium oxide layer with the porosity of 5%-10%; the porosity of the surface layer is 1t; 2% of a pure yttrium oxide layer; the melting point of the refractory metal is 2470 DEG C or higher. According to the refractory metal composite coating material and the preparation method and application thereof, the refractory metal coating structure is optimized, the porosity of the coating is further adjusted, the high-temperature molten metal corrosion resistance and the high-temperature thermal shock resistance of the coating are improved, meanwhile, the bonding strength between the coatings is guaranteed, and the service life of the coating is prolonged. The method is expected to be applied to high-melting-point metal smelting equipment.

To provide a working medium for heat cycle which has less influence over the ozone layer, which has less influence over global warming and which provides a heat cycle system excellent in the cycle performance (the efficiency and the capacity), and a heat cycle system excellent in the cycle performance (the efficiency and the capacity). A working medium for heat cycle comprising 1,2-difluoroethylene is employed for a heat cycle system (such as a Rankine cycle system, a heat pump cycle system, a refrigerating cycle system 10 or a heat transport system).

The present application relates to the technical field of decorative panels, and specifically discloses a light green fireproof decorative panel and a preparation method thereof. A light green fireproof decorative panel, using polypropylene resin, polyvinyl chloride resin, caffeic acid modified reed straw fiber, shell powder and diatomaceous earth mixed filler modified with aluminum titanium composite coupling agent JTW‑1816 as main raw materials, using bean-based adhesive and MDI adhesive as binders to prepare a light green base material, using ultra-thin fiberboard as a decorative material, and using vinyl chloride copolymer emulsion, bean-based adhesive and MDI adhesive as finishing film materials, to jointly prepare a light green fireproof decorative panel with excellent performance. The light green fireproof decorative panel prepared in the present application has the advantages of being waterproof and moisture-proof, high wear resistance, high bonding strength, good impregnation and peeling performance, resistance to cold and heat cycles, pollution resistance, excellent flame retardant performance, safety and environmental protection.

The embodiment of the invention provides a method for optimizing the roughness of the side wall of a glass through hole, which is used for solving the technical problem of high roughness of the side wall of the glass through hole manufactured by the existing glass through hole technology. According to the method, the femtosecond laser is adopted, and the material structure of the prefabricated through hole area is uniformly and deeply changed in a thermal cycle mode, so that the chemical etching sensitivity of the prefabricated through hole area is remarkably improved, and the prefabricated through hole area is more easily and uniformly removed; by optimizing the components and proportion of the etching liquid, the etching liquid uniformly covers and acts on the surface of the material in the modified area of the prefabricated through hole in the subsequent chemical etching stage, the modified material is corroded at a uniform speed, and corrosion residues are removed in time. Through etching liquid temperature control and ultrasonic power control, the mixing and reaction uniformity of the etching liquid is enhanced, and uniform and refined etching of the prefabricated through hole modification area is realized. And furthermore, the uniformity of glass through hole corrosion and the material removal precision are greatly improved, and the roughness of the side wall is obviously reduced from 1.257 microns to 100 nanometers or below.

The invention belongs to the technical field of aluminum-based composite materials, and particularly relates to a heat-resistant cyclic wear-resistant aluminum-based composite material and a preparation method thereof.Based on the total mass of the aluminum-based composite material, the heat-resistant cyclic wear-resistant aluminum-based composite material comprises an aluminum alloy matrix and a SiC particle reinforcement with the mass fraction of 15%-25%, and the SiC particle reinforcement is a mixture of micron-sized particles and submicron-sized particles; the particle size of the micron-sized particles is 10-100 [mu] m, the particle size of the submicron-sized particles is 0.3-0.8 [mu] m, the addition amount of the submicron-sized particles accounts for 0.1-2% of the total mass of the composite material, and the composite material has good wear resistance and good heat-resistant cycle performance at the normal temperature of minus 300 DEG C. The prepared SiC particle aluminum-based composite material brake disc can avoid excessive decline of material hardness, wear resistance and friction coefficient caused by thermal cycle in a repeated braking process.

The invention provides a ceramic plate and a preparation method and application thereof. The preparation method of the ceramic plate comprises the following steps: preparing a first ceramic chip by using a first ceramic material, and preparing a second ceramic chip by using a second ceramic material; wherein the first ceramic material comprises first silicon nitride, the first silicon nitride comprises beta-phase silicon nitride, the second ceramic material comprises second silicon nitride, and the second silicon nitride is alpha-phase silicon nitride; laminating the first ceramic wafer and the second ceramic wafer, and pressurizing to prepare a green diaphragm to be sintered; and sintering the green diaphragm to be sintered to prepare the ceramic plate. Ceramic slurry containing beta-phase silicon nitride and ceramic slurry only containing alpha-phase silicon nitride are respectively used for preparing ceramic chips, and then the ceramic chips are sequentially pressurized and calcined to prepare the ceramic plate, so that the growth orientation of silicon nitride crystal grains is controlled to a certain extent, the continuity among the crystal grains is realized, and the performance of the ceramic plate after being coated with copper is improved; the extension of cracks in the ceramic can be inhibited, and the thermal cycle resistance of the ceramic plate is improved.

The invention discloses a solder composition alloy and a solder ball, and belongs to the technical field of alloys. The composition alloy of the solder provided by the embodiment of the invention comprises silver, copper, nickel, germanium, bismuth and tin, and by adjusting the content of silver, the alloy can have good heat cycle resistance and drop impact resistance; by adjusting the content of nickel, the thickness of a boundary metal part of a welding spot formed by the alloy can be effectively reduced, the situation that the welding spot is broken from the boundary metal part during a ball pushing test is avoided, and then the heat cycle resistance and the falling impact resistance of the alloy are improved; by adjusting the content of bismuth, the tensile strength and yield strength of the alloy can be improved, then the heat-resistant cycle performance of the alloy is improved, meanwhile, the melting point of the alloy is reduced, and energy needed in the welding process is reduced. Therefore, through the synergistic effect of all the components, the alloy can have good heat cycle resistance and falling impact resistance at the same time, and the performance of the alloy in other aspects can be improved.

The invention relates to the technical field of metal material strengthening treatment, in particular to a micropitting-resistant wind driven generator gear carburizing and quenching composite strengthening process which comprises the following steps: S1, gear blank pretreatment and surface activation; s2, gradient carburizing strengthening treatment; s3, grain refinement annealing treatment; s4, step quenching strengthening treatment; s5, performing deep cooling and thermal cycle treatment; s6, directional tempering regulation and control treatment; s7, composite shot peening strengthening treatment is conducted; and S8, an antifriction composite film layer is deposited on the surface of the gear subjected to shot peening strengthening in the S7. According to the method, through a synergistic strengthening mechanism of gradient carburization, step quenching, structure regulation and control and surface functionalization, the residual stress distribution and tribological performance are optimized while the high surface hardness of the gear is kept, and the technical problems that in a traditional technology, the carburized layer is concentrated in stress, uneven in structure, single in surface performance and the like are solved.

The invention discloses a method for testing the mechanical property of a heat affected zone of a low-alloy ultrahigh-strength steel welded joint. The method comprises the following steps: preparing a low-alloy ultrahigh-strength steel induction heating sample; when the temperature of the middle position of the induction heating sample reaches the expected peak temperature, heating is stopped, the welding cooling process is simulated in an air cooling or air cooling mode, and the sample is cooled to the room temperature; preparing a tensile sample and a hardness sample from the induction heating sample; and respectively measuring the tensile strength of the tensile sample and the hardness of the hardness sample by adopting a universal testing machine and a microhardness tester, so as to obtain the tensile strength and the hardness of the low-alloy ultrahigh-strength steel under the normal-temperature condition after being influenced by the welding heat cycle. According to the method, the welding heat process is accurately simulated, and the simulated welding heat cycle is applied to the low-alloy ultrahigh-strength steel sample, so that the mechanical behavior of the low-alloy ultrahigh-strength steel sample is consistent with the mechanical behavior of a local microcell of a welding joint. The problem that the mechanical properties of different micro-areas of the heat affected zone of the low-alloy ultrahigh-strength steel welding joint are difficult to evaluate is solved.

A working medium including (E)-1,3,3,3-tetrafluoropropene, (Z)-1-chloro-2,3,3,3-tetrafluoropropene, and 1,1,1,2,3,3,3-heptafluoropropane, in which a content of the 1,1,1,2,3,3,3-heptafluoropropane is 8.9% by mass or less with respect to a total content of the (E)-1,3,3,3-tetrafluoropropene, the (Z)-1-chloro-2,3,3,3-tetrafluoropropene, and the 1,1,1,2,3,3,3-heptafluoropropane, and a content of the (Z)-1-chloro-2,3,3,3-tetrafluoropropene is 24.5% by mass or less with respect to the total content, as well as any application of the working medium.

The invention discloses a method for generating a metal 3D printing supporting structure, and relates to the technical field of additive manufacturing. The method comprises the steps that geometric analysis is conducted on a three-dimensional model of a to-be-printed part, and areas needing to be supported are recognized and classified into a strong supporting area, a weak supporting area and a transition supporting area; different laser scanning parameters are configured for different supporting areas, a supporting main body adopts low-energy density parameters to form a porous structure, a contact interface adopts discrete dot matrix scanning to form weak connection, and a transition layer with gradually-changed parameters is arranged between the supporting main body and the contact interface; a composite supporting structure composed of hexagonal honeycomb units and vertical thin walls is generated; in the printing process, high-frequency micro-vibration is applied to the support to improve powder fluidity, and sweep-frequency vibration is applied to the interface layer to weaken interface bonding; thermal cycle treatment is carried out after printing, and interface automatic cracking is achieved through the difference of thermal expansion coefficients; and finally, support falling is accelerated through resonance frequency vibration. Through the synergistic effect of the scanning parameter gradient, the structure optimization design and the vibration auxiliary technology, the removability of the support is remarkably improved, the material consumption is reduced, and the surface quality of the part is improved.

The invention discloses a hot air penetration type drying system for wet spunlace and a working method of the hot air penetration type drying system. The system comprises a wall frame, a thermal cycle air supplement adjusting device and a circulating fan, and an upper-layer flow guide air plate, a rotary drum drying net and a lower-layer flow guide air plate are arranged in the wall frame; the upper-layer flow guide air plate is located above the rotary drum drying net, the lower-layer flow guide air plate is located below the rotary drum drying net, and the thermal cycle air supplement adjusting devices are arranged at an inlet and an outlet of the drying oven respectively. By means of the unique penetrating type design, hot air can directly act on the surfaces of materials, the drying time is greatly shortened, and meanwhile energy consumption is reduced.

The invention discloses a double-ceramic-layer thermal barrier coating of a differentiated columnar crystal structure and a preparation method, and belongs to the technical field of thermal barrier coating corrosion and protection. The invention innovatively discovers and utilizes the double influence of the columnar crystal size on the performance of the coating; the YSZ layer adopts a fine grain structure of 1-1.5 microns, so that the bonding strength and thermal shock resistance of the coating can be obviously improved; and the modified gadolinium zirconate layer adopts a 2-3 [mu] m coarse grain structure, so that the heat conductivity can be reduced, the permeation path of CMAS along a grain boundary can be effectively inhibited, and meanwhile, the modified gadolinium zirconate layer reacts with CMAS to form a compact barrier layer to prevent further permeation of CMAS. Through accurate regulation and control of electron beam physical vapor deposition (EB-PVD) process parameters, differential control of the sizes of the two layers of ceramic columnar crystals is realized, and under the synergistic effect of the two columnar crystal structures with different sizes, the thermal cycle life and CMAS corrosion resistance of the whole coating system in an ultra-high-temperature environment are remarkably prolonged and improved.

The invention discloses a soil matrix preparation device for ecological remediation and relates to the technical field of ecological soil remediation. An isolation heat preservation barrel is fixed to the top end of an integration bearing frame, the inner side of the isolation heat preservation barrel is sleeved with a treatment integration barrel, an integration motor is installed at one end of the treatment integration barrel through a motor base, and a porous integration frame is fixed to one end of an output shaft of the integration motor; a plurality of lower discharging mixing pipes are connected to the bottom of the side end of the treatment integration barrel at equal intervals in a penetrating mode, an integration laying barrel is connected to the inner side of the fixed inlet and outlet barrel in a sleeving mode, and a mixing motor is installed at one end of the integration laying barrel through a motor base. In addition, through internal and external heat exchange and multi-group heat cycle treatment, stable temperature control is achieved, meanwhile, the situation that the compost fermentation process is affected due to the fact that the material temperature is too low is reduced, and therefore the production efficiency of the soil matrix and the product quality are guaranteed.

The present invention relates to the technical field of monazite dating, specifically to a synthesis method of monazite standard samples and the application of dual dating methods. It includes the following steps: weighing raw materials according to the stoichiometric ratio of U, Th, and Pb concentrations of the standard sample to be prepared, processing the raw materials into powder, and then grinding, compressing, and calcining them multiple times; fully grinding the sample after heat cycle treatment, mixing it with a flux and grinding evenly, and then pouring it into a crucible; placing the crucible in a high-temperature furnace to fully melt and uniformly mix all substances, quickly taking out the crucible, and rapidly quenching it to form a uniform yellow transparent phosphate glass, thereby artificially synthesizing a phosphate glass standard sample to be used for measuring the U concentration in monazite by laser ablation-inductively coupled plasma mass spectrometry, and further achieving the simultaneous and accurate acquisition of the U-Pb age and fission track age of monazite.

The invention discloses intelligent temperature control composite material roller heat treatment integrated equipment, and relates to the technical field of roller heat treatment. Comprising an equipment bottom plate, a heat treatment box is fixedly installed on the equipment bottom plate, a hydraulic cylinder is fixedly installed on the heat treatment box, a box door is fixedly installed on an output shaft of the hydraulic cylinder, the box door and the equipment bottom plate are installed in a sliding mode, an auxiliary assembly is arranged on the heat treatment box, and a heater is arranged on the auxiliary assembly. The heater is located in the heat treatment box; an adjusting assembly is arranged on the box door, and a clamping plate is arranged on the adjusting assembly; and a heat circulation assembly is arranged on the heat treatment box. Through cooperative use of the auxiliary assembly, the adjusting assembly and the heat circulation assembly, it is ensured that a roller can be evenly heated in the heat treatment box, the heat treatment efficiency is improved through circulation of hot air flowing, and the use effect of the equipment is greatly improved.

This invention proposes a multilayer circuit structure and its fabrication method. The multilayer circuit structure includes a substrate and integrated circuits disposed on both sides of the substrate. Each integrated circuit includes a flexible insulating layer and two flexible conductive layers disposed on both sides of the flexible insulating layer. Each flexible conductive layer has a rough surface and a smooth surface, with each rough surface in contact with the flexible insulating layer. One side of the flexible conductive layer has a rough surface that contacts the flexible insulating layer, significantly increasing the contact area and improving the adhesion between the flexible conductive layer and the flexible insulating layer. This design helps reduce the risk of delamination and peeling, enhances the mechanical stability of the circuit structure, and maintains stable performance, especially when subjected to thermal cycling and mechanical stress during manufacturing. The multilayer circuit structure uses a material with a certain degree of flexibility, enabling it to withstand stress from mechanical operations during manufacturing. The combination of these two factors improves the manufacturing yield of the multilayer circuit structure.

The invention discloses a spaceflight structure strength analysis method based on a multi-physics field, which comprises the following steps: establishing a parameterized finite element model integrated with a friction heat generation effect by acquiring in-orbit temperature time sequence data and material creep characteristic parameters, and simulating inelastic strain accumulation of a structure under a thermal cycle load; a nonlinear damage model considering a creep-fatigue interaction effect is adopted to calculate an accumulated damage degree, an effective stiffness matrix is constructed to deduce a structure inherent frequency drift distance and a shape retention capability parameter, and finally, through a safety margin evaluation algorithm, the effective strength of a material and the maximum equivalent stress of the structure are dynamically compared, so that the performance of the material is evaluated. And accurate prediction of quantitative residual strength and safe service life is realized. According to the method, the technical problems that the local thermal coupling effect is not depicted enough and the creep fatigue nonlinear interaction effect is ignored are solved, and the precision and reliability of on-orbit performance degradation prediction of the spaceflight flexible structure are remarkably improved.

The utility model relates to a centralized hair removal device of a continuous anti-pilling machine, which comprises a box body internally provided with an anti-pilling cylinder. The hair removal assembly comprises an inclined mounting plate, a scraper device I is arranged above the inclined mounting plate, a dust removal pipe is mounted at the end, close to the bottom of the box body, of the inclined mounting plate, the outlet end of the dust removal pipe extends out of the box body, and a pneumatic air door I is mounted at the outlet end of the dust removal pipe; the heat circulation assembly comprises a fan installed at the top of the box body, a heat exchanger is installed on the outer wall of an air outlet of the fan, an air channel I communicated with the interior of the top of the box body is installed at the air outlet of the fan, an air channel II is installed at an air inlet of the fan, and an air outlet pipe is installed at the other end of the air channel II. A pneumatic air door II is mounted at the outlet end of the air outlet pipe; through the built-in hair removal assembly, automatic cleaning of waste hair deposited below the polar fleece cylinder and waste hair attached to the filter screen before hot air circulation is achieved, the burden of manual cleaning is greatly relieved, and the production efficiency is improved.

The teachings herein are directed to multi-layered articles, methods for making the multi-layered articles, and polymeric compositions for the multi-layered articles. The multi-layered article includes a substrate layer and an overmolded cover layer. The substrate layer preferably is a polymeric composition including about 55 weight percent or less (preferably about 50 weight percent or less) polycarbonate, a styrene containing polymer, and an impact modifier. The cover layer preferably includes a polyurethane, a polyurea, or both. The substrate preferably forms a durable bond to the cover layer that maintains adhesion even after aging (e.g., heat, thermal cycling, UV light, visible light, humidity, climate aging, or any combination thereof).